source/3d/view.cpp

   1 #include <msp/gl/blend.h>
   2 #include <msp/gl/tests.h>
   3 #include "layout.h"
   4 #include "track.h"
   5 #include "view.h"
   6
   7 using namespace std;
   8 using namespace Msp;
   9
  10 namespace R2C2 {
  11
  12 View3D::View3D(Layout3D &l, unsigned w, unsigned h):
  13         layout(l),
  14         width(w),
  15         height(h),
  16         pipeline(w, h)
  17 {
  18         pipeline.set_camera(&camera);
  19         pipeline.add_renderable_for_pass(layout.get_scene(), 0);
  20         pipeline.add_renderable_for_pass(layout.get_scene(), "translucent");
  21
  22         GL::Pipeline::Pass *pass = &pipeline.add_pass(0);
  23         pass->set_lighting(&layout.get_lighting());
  24         pass->set_depth_test(&GL::DepthTest::lequal());
  25
  26         pass = &pipeline.add_pass("translucent");
  27         pass->set_lighting(&layout.get_lighting());
  28         pass->set_depth_test(&GL::DepthTest::lequal());
  29         pass->set_blend(&GL::Blend::alpha());
  30
  31         camera.set_up_direction(GL::Vector3(0, 0, 1));
  32         // Y+, 60° down
  33         camera.set_look_direction(GL::Vector3(0, 0.5, -0.866));
  34         camera.set_aspect(float(width)/height);
  35
  36         view_all();
  37 }
  38
  39 Ray View3D::create_ray(int x, int y) const
  40 {
  41         return create_ray(x*2.0f/width-1.0f, y*2.0f/height-1.0f);
  42 }
  43
  44 Ray View3D::create_ray(float x, float y) const
  45 {
  46         const GL::Vector3 &start = camera.get_position();
  47         GL::Vector4 ray = camera.unproject(GL::Vector4(x, y, 0, 0));
  48         return Ray(start, Vector(ray));
  49 }
  50
  51 void View3D::view_all(bool tight)
  52 {
  53         const set<Track *> &tracks = layout.get_layout().get_all<Track>();
  54         Geometry::BoundingBox<float, 3> bbox;
  55         for(set<Track *>::const_iterator i=tracks.begin(); i!=tracks.end(); ++i)
  56                 bbox = bbox|(*i)->get_bounding_box();
  57
  58         const Vector &minp = bbox.get_minimum_point();
  59         const Vector &maxp = bbox.get_maximum_point();
  60
  61         float t = tan(camera.get_field_of_view()/2.0f)*2.0f;
  62         float size = max((maxp.y-minp.y+0.1), (maxp.x-minp.x+0.1)/camera.get_aspect());
  63         float dist = size/t;
  64         if(!tight)
  65                 dist += sin(camera.get_field_of_view()/2.0f)*size;
  66         GL::Vector3 center = (minp+maxp)/2.0f;
  67         const GL::Vector3 &look = camera.get_look_direction();
  68         camera.set_position(center-look*dist);
  69 }
  70
  71 void View3D::render()
  72 {
  73         pipeline.render();
  74 }
  75
  76 } // namespace R2C2